Keychain, which stores passwords, registration codes, certificates, secure notes, and anything else that you want to keep secure comes with Mac OS X. It is free and it offers a good level of security for all those things you want to keep secure. Many things are automatically added to Keychain which saves you time.
However, there is one major nuisance factor and one major weakness with Keychain.
Both of the issues can easily be addressed with a new product called RiftVault which provides a deeper level of securely storing information on your Mac if you are running Leopard.
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